/*
#include<stdio.h>
#include<math.h>
main()
{
	float a,b,c;
	float s,area;
	scanf("%f,%f,%f",&a,&b,&c);
	if(a+b>c&&a+c>b&&b+c>a)
	{
		s=(a+b+c)/2;
		area = sqrt(s*(s-a)*(s-b)*(s-c));
		printf("the area is:%f\n",area);
		if(a==b&&a==c)
		printf("equilateral triangle\n");
		else if(a==b||a==c||b==c)
		printf("isocele triangle\n");
		else if((a*a+b*b==c*c)||(a*a+c*c==b*b)||(b*b+c*c==a*a))
		printf("right angled triangle\n");
		else 
		printf("triangle");
	}
	else
	printf("can not compose triangle\n"); 
}
*/